Hi!

I tested @gpu::surf@, gpu::surf, it works well
And I tried the orb, then orb,then an error happened.
(the error is shown in the image)

Here are is my codes

<pre> {
{
GpuMat img1;

img1.upload(imread("d:\\danger.png", CV_LOAD_IMAGE_GRAYSCALE));

ORB_GPU orb;

GpuMat keypoints1GPU;

GpuMat descriptors1GPU;

orb(img1,descriptors1GPU, keypoints1GPU);

waitKey(0);
}
</pre>

Thanks!